diff --git a/README.md b/README.md
index 2f7daf34..24e978cb 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,8 @@ Few things to consider while writing the connector:
 * Use `uint(-1)` of `type(uint256).max` for maximum amount everywhere
 * Use `ethAddr` (declared in `Stores`) to denote Ethereum (non-ERC20)
 * Use `address(this)` instead of `msg.sender` for fetching balance on-chain, etc
-* Only `approve()` limited amount while giving ERC20 allowance, which strictly needs to be 0 by the end of the spell.
+* Only `approve()` (Use from `Basic`) limited amount while giving ERC20 allowance, which strictly needs to be 0 by the end of the spell.
+* User interacting functions should have natspec comments(@dev, @notice, @param). 
 * Use `getUint()` (declared in `Stores`) for getting value that saved from previous spell
 * Use `setUint()` (declared in `Stores`) for setting value to save for the future spell